21389459

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{89}}^1\times {\mathrm{139}}^1$

素因数の和:267

約数の個数: 32

約数和(自身を含む): 28224000

約数和(自身を除く): 6834541

約数列:

[1, 7, 13, 19, 89, 91, 133, 139, 247, 623, 973, 1157, 1691, 1729, 1807, 2641, 8099, 11837, 12371, 12649, 18487, 21983, 34333, 86597, 153881, 160823, 235049, 240331, 1125761, 1645343, 3055637, 21389459]

約数ペア:

[(1, 21389459), (7, 3055637), (13, 1645343), (19, 1125761), (89, 240331), (91, 235049), (133, 160823), (139, 153881), (247, 86597), (623, 34333), (973, 21983), (1157, 18487), (1691, 12649), (1729, 12371), (1807, 11837), (2641, 8099)]